His Eminence Mario Mattei
Dean of the College of Cardinals
Church	Roman Catholic Church
Appointed	30 September 1860
Term ended	7 October 1870
Predecessor	Vincenzo Macchi
Successor	Costantino Patrizi Naro
Other post(s)	President of the Congregation of the Reverend Basilica of Saint Peter (1843–70) Archpriest of Saint Peter's Basilica (1843–70) Pro-Datary of the Apostolic Dataria (1858–70) Cardinal-Bishop of Ostia-Velletri (1860–70)
Orders
Ordination	c. 1817
Consecration	23 June 1844 by Vincenzo Macchi
Created cardinal	2 July 1832 by Pope Gregory XVI
Rank	Cardinal-Deacon (1832–42) Cardinal-Priest (1842–44) Cardinal-Bishop (1844–70)
Personal details
Born	Mario Mattei 6 September 1792 Pergola, Marche
Died	7 October 1870(1870-10-07) (aged 78) Rome, Kingdom of Italy
Buried	Saint Peter's Basilica
Parents	Marco Mattei Francesca Orsini Bianchi
Previous post(s)	Cardinal-Deacon of Santa Maria in Aquiro (1832–42) Camerlengo of the College of Cardinals (1834–35; 1848–50) Cardinal-Priest of Santa Maria degli Angeli (1842–44) Cardinal-Bishop of Frascati (1844–54) Cardinal-Bishop of Porto e Santa Rufina (1854–60) Prefect of the Apostolic Signatura (1854–58)
Alma mater	Pontifical Academy of Ecclesiastical Nobles La Sapienza University

Mario Mattei (6 September 1792, Pergola, Marche – 7 October 1870) was an Italian Cardinal, of the Roman noble House of Mattei. He became Dean of the College of Cardinals in 1860.

Personal life

Mario Mattei was born on 6 September 1792 in Pergola, Marche.

He was educated at the Collegio Ghislieri, a Roman college, and at the La Sapienza University where he received a doctorate in utroque iure) and later attended the Pontifical Academy of Ecclesiastical Nobles in 1810.^[1] Around 1817, he was ordained a priest.

Cardinal

He was elevated to Cardinal by Pope Gregory XVI in 1832 and was subsequently appointed to the following posts:^[2]

• 1832 – Cardinal-Deacon of St Maria in Aquiro
• 1842 – Cardinal-Priest of St Maria degli Angeli
• 1844 – Bishop of Frascati
• 1854 – Bishop of Porto e Santa Rufina
• 1860 – Bishop of Ostia and Dean of the Sacred College of Cardinals

Vatican service

In 1843, Mattei was appointed as Arch-Priest of St. Peter's Basilica and held this position until his death in 1870.

Records indicate that Mattei was appointed Camerlengo of the Sacred College of Cardinals twice; between 1834 and 1835 and between 1848 and 1850 and he was also appointed to be the Dean of the College of Cardinals in 1860. He was a participant in the First Vatican Council and in the Papal Conclave of 1846 that elected Pope Pius IX.